Hitachi 308996J - Manual (Page 17)

308996 17
Service
Reassembly
1. Fig. 6. Clean threads of displacement rod (1) and
piston housing (16). Replace u–cup seals (14) and
spacers (15). Reassemble piston nut (13) and
lockwasher (12).
2. Place flats of piston seat housing (16) in vise.
Tighten displacement rod and piston nut from 20 to
27 N
S
m (15 to 20 ft–lb).
3. Install seal (8) on cylinder (9). Lubricate seal and
threads.
4. Fig. 5. Install throat bearing (5) and u–cup seal (4)
into wet cup (2). Install seal (8) onto wet cup.
Lubricate seals and threads.
5. Install wet cup into outlet housing (7), hand tight.
6. Fig. 6. Lubricate u–cup seals (14) and insert
piston/displacement rod into cylinder (9).
7. Install cylinder, first by sliding displacement rod (1)
up through outlet housing (7) and wet cup (2), then
engage cylinder threads into outlet housing and
hand tighten.
8. Replace intake ball (17) and ball stop (3) into
intake valve (19). Install seal (8) on intake valve.
Lubricate seal and threads.
9. Install intake valve into cylinder and hand tighten.
10. Place outlet housing into vise. Using an adjustable
wrench, tighten the wet cup from 41 to 54 N
S
m (30
to 40 ft–lb).
11. Tighten the cylinder from 41 to 54 N S m (30 to 40
ft–lb) and the intake valve from 41 to 54 N S m (30
to 40 ft–lb).
12. Reconnect the displacement pump to the air motor
as detailed in Reconnecting the Displacement
Pump on page 12.